Difference between bjt and fet

In this slides there is basic difference between BJT and Fet defined and very basic terms are used ,so any one can get more information in little bit of time. thanks

1. NAME : BANGUL KHAN ROLL NO: F16BM05 ASSINGMENT SUBJ: ELECTRONIC CIRCUIT DEVICES TOPIC :DIFFERENCE BETWEEN BJT AND FET SUBMITTED TO: PROF Dr AMJAD ALI

2. Bipolar junction transistors are bipolar devices, in this transistor there is a flow of both majority & minority charge carriers . Field effect transistors are unipolar devices, in this transistor there are only the majority charge carriers flows . Bipolar junction transistors  are current controlled . Field effect transistors are voltage controlled.

3. In many applications FETs are used than bipolar junction transistors . Bipolar junction transistor consist of three terminals namely emitter, base and collector. These terminals are denoted by E, B and C . Field effect transistor consist of three terminals namely source, drain and gate. These terminals are denoted by S, D and G.

4. The input impedance of field effect transistors has high compared with bipolar junction transistors . A BJT needs a small amount of current to switch on the transistor . The heat dissipated on bipolar stops the total number of transistors that can be fabricated on the chip . Whenever the ‘G’ terminal of the FET transistor has been charged, no more current is required to keep the transistor ON.

5. The BJT is responsible for overheating due to a negative temperature co-efficient . FET has a + Ve temperature coefficient for stopping over heating BJTs are applicable for low current applications.

6. FETS are applicable for low voltage applications . FETs have low to medium gain BJTs have a higher max frequency and a higher cut off frequency.

7. BJT SCHEMATIC DIAGRAM

8. BJT SCHEMATIC DIAGRAM

9. Bipolar Transistor >> Field Effect Transistor Emitter – (E)      >>      Source – (S ) Base – (B)      >>     Gate – (G ) Collector – (C)      >>     Drain – (D) Comparison of Connections between a JFET and a BJT

10. BJTS CONFIGURATION SUMMARY

11. JFET CONFIGURATION TABLE:

12. The BJT is used as an amplifier . The BJT is used as an oscillator . It is used for wave shaping in chipping circuits . It is used as a modulator . It is used as a detector or demodulator . . BJT APPLICATIONS

13. LOW NOISE AMPLIFIER. BUFFER AMPLIFIER. CHOPPERS MULTIPLEXER MOSFETS APPLICATIONS OF JFET:

14. THANKXS